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首页> 外文期刊>Combustion and Flame >Demonstration of knock intensity mitigation through dielectric barrier discharge reformation in an RCEM
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Demonstration of knock intensity mitigation through dielectric barrier discharge reformation in an RCEM

机译：通过RCEM中介电阻挡放电改造的爆震强度减轻爆震强度减缓

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A knock intensity mitigation effect resulting from the application of dielectric barrier discharge (DBD) was experimentally demonstrated. The DBD was utilized to reform fuel-air premixtures. A rapid compression and expansion machine (RCEM) was used for the demonstration experiment. A rectangular combustion channel was installed in the RCEM's cylinder to observe flame propagation and end-gas auto-ignition behavior. The effect of the DBD was investigated by installing a plug-shaped DBD reactor in the combustion chamber. Part of the fuel-air mixture was reformed by the DBD and diffused in the chamber, and the combustion behavior was observed by a color and a monochrome high-speed camera with several different interference filters. In ordinary end-gas auto-ignition, a hot flame rapidly appears throughout the end-gas region, and generates strong pressure oscillation; whereas, in the present study, when the DBD was applied, the magnitude of the pressure oscillation decreased and a blue flame was generated in the end gas before full end-gas auto-ignition. The onset time of the blue flame, and the interval between the onset and the hot flame's appearance, depended on the fuel and initial temperature. The effect was investigated in the case of a primary reference fuel, surrogate gasoline, and n-butane lean mixture; however, though the magnitude of the effect varied, the mitigation effect was demonstrated for every fuel-air mixture. The proposed method is therefore expected to mitigate knocking in internal combustion engines and contribute to greater thermal efficiency. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：通过应用介电阻挡放电（DBD）产生的爆震强度缓解效果进行了实验证明。 DBD用于改革燃料 - 空气预混物。快速压缩和膨胀机（RCEM）用于演示实验。矩形燃烧通道安装在RCEM圆柱体中以观察火焰传播和终端气体自燃行为。通过在燃烧室中安装插头形DBD反应器来研究DBD的效果。燃料空气混合物的一部分由DBD重整并在腔室中扩散，并且通过具有几种不同的干涉滤光器的颜色和单色高速相机观察燃烧行为。在普通的终端气体自动点火中，在整个端气区域中快速出现热火焰，产生强大的压力振荡;然而，在本研究中，当施加DBD时，在完全终止气体自燃之前，在最终气体中产生压力振荡的大小和蓝色火焰。蓝色火焰的起始时间，并且开始和热火焰之间的间隔，依赖于燃料和初始温度。在初级参考燃料，替代汽油和正丁烷瘦混合物的情况下研究了效果;然而，尽管效果的幅度变化，但为每个燃料空气混合物证明了缓解效果。因此，预期该方法预计将减轻内燃机中的爆震，并有助于更大的热效率。 （c）2020燃烧研究所。由elsevier Inc.出版的所有权利保留。

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